Co-simulation Of Separating Process Of Straw Walker Of Combine Harvester Based On EDEM And RecurDyn

This project is supported by the national key research and development plan "Research on the Theory and Method of Intelligent Design of Agricultural Machinery Equipment for Customization and Diversion Demand"(2017YFD0700101).In view of the phenomenon of long test cycle,high cost,and large loss rate and high impurity rate in the process of separation,the four-screen and four-ladder straw walker is taken as the research object.In order to explore the influence of various parameters on its separation performance,the EDEM-Recur Dyn co-simulation analysis and research are carried out on the separation process.The optimal range of structure and operating parameters is obtained.To solve the problems of explosive growth of data and chaotic process management caused by co-simulation,a co-simulation management system based on Teamcenter was developed.By designing the test bench of the straw walker,the test is verified and compared with the results of the simulation analysis,which verifies the correctness of the co-simulation analysis.The specific research work and results of this paper are as follows:(1)Theoretical analysis of separation process of straw walker.On the basis of analyzing the modeling theory of EDEM and Recur Dyn for the separation process of the straw walker,the collision and movement of rice in the separation process of the straw walker were mathematically modeled,the working conditions of the straw walker were determined,and the influence of the main working parameters on the movement of rice on the straw walker was discussed.It provides a theoretical basis for the subsequent simulation and verification tests.(2)Construct multi-body dynamics and discrete element numerical simulation models.Using Solid Works,the 3D CAD model of the straw walker was designed,and the virtual assembly was carried out,and it was imported into Recur Dyn to construct the multi-body dynamics simulation model of the straw walker.At the same time,the Nangen9108 rice model was established in EDEM,and the physical parameters that need to be set in the simulation were calibrated through design experiments,including: the angle of repose of the rice grain,the static friction coefficient and the coefficient of restitution between the rice grain and the straw walker.(3)EDEM-Recur Dyn collaborative simulation environment establishment and simulation management.Two methods to realize co-simulation based on unified modeling language and based on interface are studied,and their advantages and disadvantages are compared.In view of the simulation requirements of the separation process of the straw walker,the point-to-point configuration of the interface method is determined to be a collaborative simulation environment of the straw walker separation process,and the data exchange between EDEM and Recur Dyn is studied,and the co-simulation is proved through experiments.The effectiveness of the environment.A collaborative simulation management system was established based on Teamcenter,and the key technologies and implementation methods of collaborative simulation data and process management were studied.(4)Co-simulation analysis and experiment of separation process of the straw walker.Combined with GB/T 6979.1-2005 national standard for combine harvester and its functional components,the effects of crankshaft speed,crankshaft radius and surface Angle on the separation performance of straw walker were simulated and analyzed,and the range of parameters was optimized.A test bench was designed,and the theory and simulation were verified by bench test using high speed photography technology.